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// Test fopencookie interceptor.
// RUN: %clangxx_msan -std=c++11 -O0 %s -o %t && %run %t
// RUN: %clangxx_msan -std=c++11 -fsanitize-memory-track-origins -O0 %s -o %t && %run %t
#include <assert.h>
#include <pthread.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sanitizer/msan_interface.h>
constexpr uintptr_t kMagicCookie = 0x12345678;
static ssize_t cookie_read(void *cookie, char *buf, size_t size) {
assert((uintptr_t)cookie == kMagicCookie);
memset(buf, 0, size);
return 0;
}
static ssize_t cookie_write(void *cookie, const char *buf, size_t size) {
assert((uintptr_t)cookie == kMagicCookie);
__msan_check_mem_is_initialized(buf, size);
return 0;
}
static int cookie_seek(void *cookie, off64_t *offset, int whence) {
assert((uintptr_t)cookie == kMagicCookie);
__msan_check_mem_is_initialized(offset, sizeof(*offset));
return 0;
}
static int cookie_close(void *cookie) {
assert((uintptr_t)cookie == kMagicCookie);
return 0;
}
void PoisonStack() { char a[8192]; }
void TestPoisonStack() {
// Verify that PoisonStack has poisoned the stack - otherwise this test is not
// testing anything.
char a;
assert(__msan_test_shadow(&a - 1000, 1) == 0);
}
int main() {
void *cookie = (void *)kMagicCookie;
FILE *f = fopencookie(cookie, "rw",
{cookie_read, cookie_write, cookie_seek, cookie_close});
PoisonStack();
TestPoisonStack();
fseek(f, 100, SEEK_SET);
char buf[50];
fread(buf, 50, 1, f);
fwrite(buf, 50, 1, f);
fclose(f);
f = fopencookie(cookie, "rw", {nullptr, nullptr, nullptr, nullptr});
fseek(f, 100, SEEK_SET);
fread(buf, 50, 1, f);
fwrite(buf, 50, 1, f);
fclose(f);
}
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